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| 1 // Copyright 2016 PDFium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com |
| 6 |
| 7 #ifndef CORE_FXCRT_INCLUDE_CFX_WEAK_PTR_H_ |
| 8 #define CORE_FXCRT_INCLUDE_CFX_WEAK_PTR_H_ |
| 9 |
| 10 #include "core/fxcrt/include/fx_system.h" |
| 11 |
| 12 template <class T> |
| 13 class CFX_WeakPtr { |
| 14 public: |
| 15 class Handle { |
| 16 public: |
| 17 explicit Handle(T* ptr) : m_nCount(1), m_pObj(ptr) {} |
| 18 void reset(T* ptr) { // CAUTION: tosses prior ref counts. |
| 19 m_nCount = 1; |
| 20 m_pObj = ptr; |
| 21 } |
| 22 void clear() { // Now you're all weak ptrs ... |
| 23 // Guard against accidental re-entry. |
| 24 T* pObj = m_pObj; |
| 25 m_pObj = nullptr; |
| 26 delete pObj; |
| 27 } |
| 28 T* get() const { return m_pObj; } |
| 29 T* AddRef() { |
| 30 ASSERT(m_pObj); |
| 31 ++m_nCount; |
| 32 return m_pObj; |
| 33 } |
| 34 void RemoveRef() { |
| 35 if (m_nCount) |
| 36 --m_nCount; |
| 37 } |
| 38 size_t use_count() const { return m_nCount; } |
| 39 |
| 40 protected: |
| 41 size_t m_nCount; |
| 42 T* m_pObj; |
| 43 }; |
| 44 |
| 45 // TODO(tsepez): implement weak pointer operations themselves. |
| 46 }; |
| 47 |
| 48 #endif // CORE_FXCRT_INCLUDE_CFX_WEAK_PTR_H_ |
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